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  2. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.

  3. CSS HTML Validator - Wikipedia

    en.wikipedia.org/wiki/CSS_HTML_Validator

    CSS HTML Validator is developed, marketed, and sold by AI Internet Solutions LLC located in Texas. [1] The first version of CSS HTML Validator was released in 1997 for Windows 95. The current version is 2024/v24.03 [2] (as of June 24, 2024) and is for Windows 10 and above, including Windows 11.

  4. Email authentication - Wikipedia

    en.wikipedia.org/wiki/Email_authentication

    An outstanding rationale for email authentication is the ability to automate email filtering at receiving servers. That way, spoofed messages can be rejected before they arrive to a user's Inbox. While protocols strive to devise ways to reliably block distrusted mail, security indicators can tag unauthenticated messages that still reach the Inbox.

  5. mailto - Wikipedia

    en.wikipedia.org/wiki/Mailto

    mailto is a Uniform Resource Identifier (URI) scheme for email addresses.It is used to produce hyperlinks on websites that allow users to send an email to a specific address directly from an HTML document, without having to copy it and entering it into an email client.

  6. HTML form - Wikipedia

    en.wikipedia.org/wiki/HTML_form

    HTML 5 introduces a number of input tags that can be represented by other interface elements. Some are based upon text input fields and are intended to input and validate specific common data. These include <email> to enter email addresses, <tel> for telephone numbers, <number> for numeric values.

  7. Certified Server Validation - Wikipedia

    en.wikipedia.org/wiki/Certified_Server_Validation

    Certified Server Validation (CSV) is a technical method of email authentication intended to fight spam. Its focus is the SMTP HELO-identity of mail transfer agents . Purpose

  8. W3Schools - Wikipedia

    en.wikipedia.org/wiki/W3Schools

    W3Schools is a freemium educational website for learning coding online. [1] [2] Initially released in 1998, it derives its name from the World Wide Web but is not affiliated with the W3 Consortium. [3] [4] [unreliable source] W3Schools offers courses covering many aspects of web development. [5] W3Schools also publishes free HTML templates.

  9. GTUBE - Wikipedia

    en.wikipedia.org/wiki/GTUBE

    The GTUBE ("Generic Test for Unsolicited Bulk Email") is a 68-byte test string used to test anti-spam systems, in particular those based on SpamAssassin. [1] In SpamAssassin, it carries an anti-spam score of 1000 by default, which would be sufficient to trigger any installation.